Charles w



(No Model.)

' W. EMERY.

MAG FOR FORGIN G NAILS.

No. 449,526. Patented Mar. 31, 1891.

II III UNITED STATES PATENT OFFICE.

CHARLES EMERY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE PUTNAM NAIL COMPANY, OF SAME PLACE. I

' MACHINE FOR FORGING NAILS.

SPECIFICATION forming part of Letters Patent N0.-449,526, dated March 31, 1891.

Application filed January 15, 1891. Serial No. 377,804. (No model.)

To all whom it may concern:

Be itknown that I, CHARLES l/V.EMERY, of Boston, in the county of Sulfolk and State of Massachusetts, have invented a new and useful Improvement in Machines for Forging Nails or the Like, of which the following is a specification, reference being had to the accompanying drawings, in whiol1- Figure 1 is a view showing the ends of two pairs of forging-hammers. Fig. 2 is a section on line 2 2 of Fig. 1, and Fig. 3 is a section on line of Fig. 1. view.

My invention relates to machines of the type shown in United States Letters Patent No. 207,444, dated August 27, 1878; and it consists,first,in the combination of two pairs of vibrating hammers, the pivots of one pair being nearer the hammer-heads than the pivots of the other pair; secondly, in the combination of a vibrating hammer having a projection with a heavier hammer having a projection adapted to engage with the projection on the lighter hammer.

In the drawingsfln which the hammers are conveniently arranged and operated as in the Letters Patent referred to, though obviously they may be operated by various other means, a a are hammers pivoted at a and having co-operating projections o as in said Letters Patent. b Z) are another pair of hammers pivoted at 11 and, unlike the second pair of hammers in said patent, have co-operating projections 12 To enable each pair of hammers to vibrate without their projections interfering with the projections of the other pair, the pivots of one pair are farther removed from the heads of the hammers than the pivots of the other pair, so as to allow the free play and proper action of the projections a a and b 12 The effect of this arrangement is to give a greater drawing blow to the pair of hammers whose pivots are nearer the hammer heads. It is Well known that the sides of the nail to be formed require a less drawing blow than the flat surfaces, and consequently I pivot the hammers a a, which operate on the flat surfaces of the nail, nearer the heads of the hammer than I do the hammers b I), which operate on the Fig. 4 is a perspective.

sides of the nail, as will be readily under stood by all skilled in the art. This is one feature of my invention and is an important novelty.

It is highly desirable ,that the hammers should strike positively at the common center, and that the limits of their inward movement should be the same in respect to the longitudinal axis of the nail being formed. In order to accomplish this result I make the leading hammer of each pair heavier than its companion, so that by increased momentum it bears its projection against the projection on its companion hammer.

In Fig. 2 the hammer a is heavier than hammer a, and its projection a engages with the projection a on hammer a when the hammer-heads move toward each other and causes the hammer a to come up to the common center in unison. The hammers are actuated in pairs, as heretofore.

What I claim as my invention is- 1. The herein-described combination of vibrating hammers a a Z) Z) in pairs, the pivots of one pair being nearer the heads of the hammers than the pivots of the other pair, substantially as and for the purpose set forth.

2. The herein-described combination of two pivoted hammers, each having a projection, one of which engages with the other, and one of the hammers being heavier than the other, substantially as and for the purpose set forth.

3. The herein-described combination of two pairs of hammers, each hammer having a projection which engages with the projection 011 its companion, and one hammer of each pair being heavier than its mate. all substantially as and for the purpose set forth.

4. The herein-described combination of vi-' brating hammers a a b b in pairs, each hammer having a projection which engages with the projection on its companion, and the pivots of one pair being nearer the heads of the hammers than the pivots of the other pair, substantially as and for the purpose set forth.

CHARLES IV. EMERY. 

